ACSPRI Conferences, RC33 Eighth International Conference on Social Science Methodology

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How to estimate the intra-cluster correlation coefficient strictly positively?

Siegfried Gabler, Matthias Ganninger

Building: Law Building
Room: Breakout 3 - Law Building, Room 104
Date: 2012-07-10 01:30 PM – 03:00 PM
Last modified: 2012-01-12


We consider the estimation of the intra-cluster correlation for the one-way random effects model in the case of balanced and unbalanced cluster sizes. It is well-known that the standard variance component methods, such as the ANOVA method, can produce zero and negative estimates of the intra-cluster correlation, which is inherently a strictly positive parameter. In this paper, we present an adjusted maximum likelihood estimator for the intra-cluster correlation coefficient and compare the proposed estimator with the commonly used ANOVA estimator using a Monte Carlo simulation for normal and beta-binomial distributed variables.